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The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4, [3] and was specified in 1992 as RFC 1321.
md5sum is specific to systems that use GNU coreutils or a clone such as BusyBox.On FreeBSD and OpenBSD the utilities are called md5, sha1, sha256, and sha512.These versions offer slightly different options and features.
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
In cryptography, CRAM-MD5 is a challenge–response authentication mechanism (CRAM) based on the HMAC-MD5 algorithm. As one of the mechanisms supported by the Simple Authentication and Security Layer (SASL), it is often used in email software as part of SMTP Authentication and for the authentication of POP and IMAP users, as well as in applications implementing LDAP, XMPP, BEEP, and other ...
Digest access authentication is one of the agreed-upon methods a web server can use to negotiate credentials, such as username or password, with a user's web browser.This can be used to confirm the identity of a user before sending sensitive information, such as online banking transaction history.
SMTP as specified by Jon Postel in the 1970s did not provide for using passwords for sending email messages; each server was by design an open mail relay.As a result, spam and worms, while not initially a problem, had become a plague by the late '90s. [2]
In HTTP version 1.x, header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message.
The Secure Hash Algorithms are a family of cryptographic hash functions published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS), including: